For comparison with the icing I was seeing this past weekend (also XP8x4 and stock calipers, can't be far from Spohn's overall setup, except perhaps in rotor heat capacity / cooling), my most common (only actually) track surface is in fact quite ripply and bumpy, and notably so in the one section where I first had the major ice-mode problem.
In that section the weight transfer is not only heavy to the front from the braking itself, but is also heavy to the right from having just barely completely a fast left sweep before getting into the brakes. There's also a decent chance that during that initial problem stop, I hadn't quite finished rotating the car to its new straight-line direction before jumping into the brakes, by a scant few degrees. I'll probably know better once I have all the video processed.
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